If that's the case I have a problem. At 6000rpms my oil pres claims to be 38psi!
[Z06] Oil pressure question
Thread Starter
Burning Brakes
Joined: Dec 2004
Posts: 1,047
Likes: 207
From: Columbus Ohio
Oil pressure question
I have a 383 stroker motor with a 243/250 cam and a ported LS6 oil pump using 15W50 Full syn oil. On startup it will idle around 50-55psi then drop down to around 30-35psi when everything is warmed up. On full open throttle it will hang around 25-29psi which I feel is still low imop. Is this normal for this motor or should I have higher oil pressure.
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
I have a 383 stroker motor with a 243/250 cam and a ported LS6 oil pump using 15W50 Full syn oil. On startup it will idle around 50-55psi then drop down to around 30-35psi when everything is warmed up. On full open throttle it will hang around 25-29psi which I feel is still low imop. Is this normal for this motor or should I have higher oil pressure.
The oil pressure gauge has a "delay" in reporting the pressure. If you simply rev the engine (blip the throttle) you may not accurately see oil pressure rise and fall. You need a constant engine speed for about 1 to 2 seconds to see an "accurate" pressure reading.
Instructor
Joined: Jun 2007
Posts: 104
Likes: 0
From: Medford Or
It is not the throttle position that determines oil pressure, but the engine RPM. As RPM rise you should see oil pressure rise. Running about 1500 RPM (cruising on highway in 6th gear) you should see 30 to 35 PSI. At a constant 3000 RPM you should see 40 plus PSI.
The oil pressure gauge has a "delay" in reporting the pressure. If you simply rev the engine (blip the throttle) you may not accurately see oil pressure rise and fall. You need a constant engine speed for about 1 to 2 seconds to see an "accurate" pressure reading.
The oil pressure gauge has a "delay" in reporting the pressure. If you simply rev the engine (blip the throttle) you may not accurately see oil pressure rise and fall. You need a constant engine speed for about 1 to 2 seconds to see an "accurate" pressure reading.
Racer
Joined: Jul 2006
Posts: 447
Likes: 0
From: San Jose Ca
This could be ideal for many engines, but I've noticed on my own engine builds that 5psi per 1000rpm is acceptable. Provided pressure at idle is above 25.
Thread Starter
Burning Brakes
Joined: Dec 2004
Posts: 1,047
Likes: 207
From: Columbus Ohio
I wonder if this is the case and my idle pressure is always around 25psi. It's a really weird problem and i plan on installing an oil pressure gauge to see if I’m getting an accurate reading of the oil as I know C-5's are known for blowing oil pressure sending units. Might be a good start as the last thing I want to do is tear apart my motor. I really don't have any negative side effects because of the low oil pressure and when I’m in the upper rpms oil pressure slowly begins to climb throughout the rpm range. But will still stay around 30psi. I didn't know if this a normal condition with a ported LS6 oil pump. Any other ideas and thanks BlackZ06 I didn't know that and is helpful info.
Last edited by LCZ06; Jul 29, 2007 at 06:12 PM.
Thread Starter
Burning Brakes
Joined: Dec 2004
Posts: 1,047
Likes: 207
From: Columbus Ohio
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